Oh what a shame you cut it back so brutally Phil. Hopefully no canker or other bacteria will have got in via the sawn cuts. Because it has been so drastically pruned but has a large root system for a big tree, it will produce a lot of vegetative growth ie shoots which will not flower this year but which are aimed at making the tree big again - which you don't want. You want to keep your tree under control and producing fruit not huge branches.
So now you need to think what shape you want it to be. There are several new laterals coming from the main trunk - do you want to keep those or do you want to just have the pompom bits on the top? It would probably be best to remove the ones on the trunk, so cut them flush with the bark.
Then you have three big branches, each of which is trying to turn into a new tree. Once branches start to grow from all of them you will be back to the tangle you had before. If it was my tree, I would remove all but one big branch (cut them off near the trunk which is to be kept, in the winter, not now) and choose the branch which best balances the tree ie the one coming back over the main trunk to be your new tree shape. Then shape the new tree top as you would any new tree. So you would choose 5 or 6 of the best placed and sturdiest new shoots, and remove the others. The shoots you chose at this stage will govern the eventual shape of your tree so choose shoots which are evenly spaced around the trunk. Cut the chosen shoots back to about 2/3rds of their current length in June, then in the winter cut them back again to about half their length, cutting to an outward facing bud. Your aim is to create a flattish goblet-shaped top to your tree, with a space in the centre to allow air to circulate, and fruit within reach. If you choose an outward facing bud to be the top one of your cut side shoot, then the next length to grow in the coming season will help the shape to spread out, whereas if you cut to an inward facing bud the new shoots will head towards the middle of the tree and become a tangle, with crossed branches etc.
Next winter you can prune for fruit
